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Author Topic:   wheel and tires 101
Dirt Maniac

Total posts: 120
posted April 13, 2004 02:01 PM  
First off is the correct way to measure the backset of a rim to measure from where it touches the hub (center) to the very edge of the rim? Next we have to run radials, when changing tire pressure from 15 to 35 lbs the roll-out changed very little to none, should it change at all? With 2", 3", and 4" (several of each) backset rims, which do we start with on which corners? Lets end the lesson with how much stagger to run front and back. Thank in advance for any and all help.

Dirt Maniac

Total posts: 118
posted April 13, 2004 02:43 PM  
Offset is measured from the outer edge of rim to the surface of the bolt flange. I often lay them face down on the cement and measure through the center hole.

Radial tires change very little as air pressure changes. Air pressure still effects handling because you are changing the "spring rating" effect from the tire.

Stagger would depend on the track you plan to run. Less banking usually requires less stagger but all would depend on how the driver likes the car to feel.

Hope this helps some.


Dirt Forum Champ
Total posts: 516
posted April 13, 2004 05:03 PM  
Offset is measured from the backspace subtracted from the center of the wheel. Example: If you have a 10" wheel with 3" of backspace, you take 5" which is the center of 10 subtract 3" that gives you 2" of offset, that is the proper way to measure offset. The above mentioned ways to measure backspace are correct.

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